Determine location URL with request's current URL's fragment

Complements whatwg/fetch#696. See that pull request for context and tests.

Author: annevk

source

@@ -84903,7 +84903,8 @@ interface <dfn>Location</dfn> { // but see also <a href="#the-location-interface
        </li>
 
        <li><p>Set <var>locationURL</var> to <var>response</var>'s <span
-       data-x="concept-response-location-url">location URL</span>.</p></li>
+       data-x="concept-response-location-url">location URL</span> given <var>currentURL</var>'s
+       <span data-x="concept-url-fragment">fragment</span>.</p></li>
 
        <li>
         <p>If <var>locationURL</var> is not a <span>URL</span> whose <span